Registering and controlling equipment



W. W. CARPENTER.

REGISTERING AND CONTROLLING EQUIPMENT.

APPLICATION FILED DEC.30. 1916.

1,322,759. Patented Nov. 25, 1919.

4 SHEETSSHEET I.

8 lII-IIIIIII IIIIIIII 7 LULLI I. A h I 4 W. W. CARPENTER.

REGISTERING AND 00 NTROLLING EQUIPMENT.

APPLICATION FILED DEC.30. 19l6- Patented Nov. 25, 1919.

4 SHEETS-SHEET 2.

W. W. CARPENTER.

REGISTERING AND CONTROLLING EQUIPMENT.

APPLICATION FILED DEC.30. 1916.

1 22,759. Patented Nov. 25, 1919.

4 SHEETS-SHEET 3- Y flvvew/or: Warm/7 W Carpe/vfe/c' fiy 4 SHEETS-SHEET 4.

Patented Nov. 25 1919.

W. N. CARPENTER.

REGISTERING AND CONTROLLING EQUIPMENT.

APPLICATION FILED DEC.30. I916.

we VD m .m. 3 s s W x .5 l f a I13 W M Q 3 3 +1? n n S [113 N fi X 3 113. I131 wmEN w. CARPENTER, or NEWARK, NEW JERSEY, ASSIGNOIB. TO WESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION or NEW 1on3.

following is a full, clear, concise, and exact description.

The invention relates to registering and' controlling equipments for telephone exchange systems, in which automatic switches are employed for the purpose of establishing the connection between the calling and a called line. Equipments of this character are well-knownin the art, and generally comprise a register or registers which are adapted to be set to register or store the designation of the called line in response to either the operation of keys at an operators position or to the operation of a substation sender at the subscribers substation. The registers when set are adapted to control the extent of operation of a counting device, which may be either a set of counting relays or a step-by-step switch. The counting device is adapted to be operated synchronously.

with the switch under control, and the ex tent of operation of the counting device determines the extent of the operation of the switch.

It is the object of the present invention to improve the operation of equipments of this character by reducing the time necessary for.

the setting of the registers. In accordance with a feature of the invention, this object is attained by providing the registers with a number of set or registering positions, which is less than the total number of digits it is desired to register, instead of employing a registering position for each digit. In accordance with this feature of the invention the register is adapted to register either of two numbers in each set position, and means are associated with the register and controlled from the means utilized in setting the register, to discriminate between these two numbers, and to cooperate with the register in controlling the operation of the counting device. Thus a register may in a single position register two consecutive numbers, one of which is odd and the other of which is even. If th larger number of the two is registered, a relay associated with the reg- REGISTERING- AN D CONTROLLING EQUIPMENT.

Specification of Letters Patent. Patented NOV- 25, 1919. Application filed December 30, 1916. Serial No. 139,897.

ister is not operated, and the register controls the counting device direct to cause such counting device to count a number equal to that of the highest number represented by the set position of the register.

lay associated with the register is operated, and serves to modify the o eration of the counting device by eliminating one step or stage from the operation of such counting device, thus causing such counting device to count the lower number.

In accordance with a further feature of the invention registers are employed which are moved to their set position by means of a powerlmagnet, the circuit of which is interrupted when the register reaches such set position by means of a cut-off relay which is energized when the register reaches such position, this cut-off relay being subsequently employed for the purpose of discriminating between the two numbers represented by a single set position of the register, and for modifying the operation of the counting relays accordingly.

Features of the invention not specifically referred to above will more clearly appear from a consideration of the specification and the accompanying drawings in which: Figure 1 shows a connecting circuit having an automatic switch associated therewith; Fig. 2 shows a portion of the registering and controlling equipment, and a cord finder for as sociating such registering and controlling equipment with the connecting circuit shown in Fig. 1; Figs. 3 and 4 show other portions of the registering and controlling. equip- :ment; and Fig. 5 is a diagram illustrating with the connecting circuit and the connec tion is extended to. the called line in response to the operation of the registering and con- If, on the other hand, the lower numberis registered, the re trolling equipment as determined by theoplowed by the sequence switch position at the time in parentheses. In order to identify the contact with the particular sequence switch to which it is individual the same initial digit is used in reference numerals representlng such contacts as in the reference numerals em loyed to represent the sequence switch. T e registers are of the sequence switch type and have no normal position, remaining in the position when last used until again taken for use.

It.is thought that the invention can be best understood from a description of the operation of the registering and controlling equipment in exercising its function in directing the operation of a selector and connector switch to extend the connection to the terminals of'a called-line.

It will be assumed that the subscriber indicated. at A initiates a call .for line No.

7849. The line relay 1 is energized in the usual manner and closes at its armature and contact a circuitwhich illuminates the calling lamp 2. Having observed that the calling lamp 2 is illuminated, the operator in-' serts the plug 3 into the jack 4 and operates her listening key indicated at 5, plac ng herself in communication with the calling subscriber. As soon as the plug 3 is inserted in the jack 4, the cut-off relay 6 is energized in series with the relay 101 over a circuit which extends from battery, cut-0H relay 6, sleeve of jack 4, sleeve of the plug 3, relay 101, to ground. The energization of relay 101 establishes a circuit .to drive the sequence switch 100 into position 2, which circuit extends from battery, sequence switch 100, contact 102 (position 1), front contact and armature of relay 101 to ground.

- In position 2 of the sequence switch 100, contact 103 closes a circuit to drive the sender sequence switch 200 into position 2, and also places test potential on the test terminal 203 of the cord finder associated with such sender. The circuit for driving the sequence switch 200 into position 2 extends from battery, motor magnet of sequence switch 200, contact 204 (position '1), contact 103 (position 2), to ground. In

position 2 of the sequence switch 200 a circuit is established for the up-drive magnet 201 of the 'cord finder, which circult extends from battery, magnet 201, contact 205 (position 2), back contact and left armature of the relay 202 to ound. As soon as the test brush 206 of t e cord finder reaches the terminal 203, a circuit is established for the test relay'202, which extends from battery, test relay 202, contact 207 (position 2), brush 206, terminal 203, contact 103 to ground. The test relay locks up over the ollowmg circuit, which is maintained in positions 2 to 16 of the sequence switch 200, and positions 2 to 11 of the sequence switch 100.: from battery, relay 202, contact 207 (positions 2 to 16), front contact and left armature of relay 202, brush 208, terminal 209, contact 103' (positions 2 to 11), to ground. The energization of the test relay 202 opens the previously traced circuit for the up-drive magnet 201, and stops the cord finder with the brushes 210 and 211 thereof 1n contact with the terminals 212, 213, which are connected to the particular cord which has been taken for use. Relay 202 also closes at its left-hand armature and front contact a circuit to drive the sequence switch 200' into position 3, which circuit extends from battery, sequence switch 200, contact 214 (position 2), front contact and left armature of the relay 202 to ground.

With the sequence switch 200 in position 3, the operator sets up the number of the called line on a key set shown in Fig. 4, by depressin the N0. 7 thousands keys, the No. 8 hundre s key, the No. 4 tens key and the No. 9 units key. The depression of any key in a row closes off-normal contacts individual to such row, which off-normal contacts are indicated-at 501, 502, 503 and 504. As

' soon as the lastkey has been depressed the following circuits are established for the thousands, hundreds, tons and units registers: battery, contact 215 (position 3), conductor 465, register power magnets 400, 401,

'402, 403, and thence by the back contacts of register cut-off relays 404, 405, 406 and 407, respectively, conductor 408, contact 216 (position 3), conductor 409, off-normal contact of each row of keys 501, 502, 503 and 504, to ground. When the thousands register reaches position 3 the following circuit is established for the register cut-ofl' relay 404: battery, register cut-off relay 404, conductor 410, contact 217 (position 3), conductor 411, register contact 412 (position 3), conductor 413, right contacts of the No. 7 key, conductor 414, conductor 415 to ground. The operation of the relay 404 stops the thousands register in position 3, by opening the previously traced circuit for the register power magnet 400.

As soon as the hundreds register reaches position 3 the following circuit is closed for the register out-ofi' relay 405, due to the depression of the No. 8 hundreds key: from battery, cut-off relay 405, conductor 416, contact 218 (position 3), conductor 417,

. ofl' relay 406, conductor 418, contact 219 421 (position 2),

contacts of the No. 9 e

conductor 419, register contact contacts of the No. 4 key, conductor 506, conductor 415, "to ground. Therefore, the tens register is stopped at position 2 as the cut-01f relay 406 opens the previously traced energizing circuit for the register power magnet 402.

As soon as the units register reaches position 4, a circuit is established for the register cut-0E relay 407, due to the depression of the No. 9 units key, which circuit extends from battery, "cut-0E relay 407, conductor 422, contact 220 (position 3), conductor 423, register contact 424 osition 4) to the right (position 3),

ductor 415, to ground. The cut-off relay 407 opens the previously traced energizing c rcuit for the power magnet 403 of the units register, which stops the unitsregister in position 4. Therefore, for the number set up on the keys, namely, 7, 8, 4, 9, it w ll be seen that the registers are set in posit ons 3, 4, 2, 4, respectively.

When the last cut-off relay has been energized, the following circuit is established to' drive sequence switch 200 into position 4, from battery to the 'motor magnet of the sequence switch 200, contact 221 (position 3), conductor 425, armature and front contact of cut-off relay 407, conductor 426, contact 222 (position 3), conductor 427, front contact and armature of relay 406, conductor 428, contact 223 (position 3), conductor 429, front contact and left-hand armature of cutoff relay 405, conductor 430, contact. 224

(position 3), conductor 431, fronticontact and left-hand armature of cut-off rel ay 404, conductor 432, contact 225 (position 3), to

ground.

As the sequence switch 300 leaves position 33;, he previously traced energizing circuits for the cut-ofi' relays 404, 405, 406 and 407 are interrupted, causing these cut-off relays to release. At the same time the preconductor 507, con- However, when the sequence switch in position 3% to 3%, conductor 434, left-hand contact of the No. 8 hundreds key, conductor 505, conductor 415, to ground; from battery, cut-off relay 405, conductor 416, contact 218 in position 31} to 3%, conductor 433, lefthand contacts of No. 7 thousands key, conductor 514, conductor 415, to ground; from battery, cut-off relay 407, conductor 422, contact 220 in position 31} to 3%, conductor 435, left-hand contact of the No. 9 units key, conductor 507, conductor 415, to ground. As a matter of fact, the interval between position 3% and position 3% of the sequence switch 200 is so short that the relays 404, 405 and 407 do not release. The effect, however, is the same whether they release and reenergize or fail to release.

It will be observed from the circuits just traced that if an odd-numbered thousands key is depressed the cut-off relay 405 is maintained energized in position 3% to 3% of the sequence switch 200, and, similarly, if the hundreds key is above 5, the cut-off relay 404 is maintained energized. If the operated tens and units keys are odd, the relays 406 and 407 will be maintained energized.

As soon as the sequence switch 200 reaches position 4, the cut-off relays, which have been energized, namely, relays'404, 405 and 407, are locked up, the locking circuit for the relay 404 extending, as before traced, to contact 217 in position 4, and from thence by conductor 436, front contact and righthand armature of cut-0E relay 404, conductor 408, conductor 226, contact 227 in position 4, to ground. The locking circuit for the cut-off relay 405 extends, as previously traced, to the contact 218 osition 4), and from thence'by conductor 43 front contact and right armature of cut-off relay 405, conductor 408, conductor 226, contact 227. (position 4) to ground. The locking circuit for the cut-off relay 407 extends, as previously traced, to the contact 220 (posi ,tion 4), conductor 438, front contact and right-hand armature of the cut-off relay 407,

.conductor 408, conductor 226, contact 227 be established for the magnet 7, from battery, through the allotter contact 8, magnet 7, contact 228 (position 4), and thence by conductors 423, 419, 417 or 411, and through the contacts of the key, which fails to restore, to conductor 415, and ground.

However, assuming that the keys restored l properly, the sequence switch 200 is driven into position 5 over a circuit whlch extends from battery to the motor magnet of sequence switch 200, contact 221 in position 4, left-hand armature and back contact of the malgnet 7, .to ground.

n position 5 of the sequence switch 200 the so-called fundamental circuit leading to the first selector is established. This circuit may be traced fromabattery, through the line relay 103, contact 104 (position 2), conductor 105, terminal 212, brush 210, back contact of the cut-off relay 229, contact 230 (position 5), stepping magnet 231, brush 21'1, terminal 213, conductor 1.06, contact 10? (position 2), to ground. The relay 103 and the stepping magnet 231 are energized in this circuit. As a result of the energization of the line relay 103, a circuit is established to drive the sequence switch 100 into position 3. Thiscircuit extends from battery, through the motor magnet of the sequence switch 100, contact 108 (position 2), front contact and right-hand armature of relay 103 to ground. When the sequence switch 100 reaches position 2 the line relay 103 is maintained energized over a circuit which extends from battery, relay 103, left-hand armature and front contact thereof, contact 104, and thence through the stepping relay 231 to ground at contact 107 (position 3), or from the contact 104 over conductor 109, commutator 110, brush 111, to ground, while the elevator rod of the first group selector is in motion.

Line relay 103 also closes at its right-hand armature and contact a circuit for the updrive magnet 117 of the group selector, which circuit extends from battery, through up-drive magnet 117, contact 113 (position 3'), front contact and right-hand armature of the relay 103 to ground. As the elevator shaft moves upward the brush 111 in passing over the commutator 110 intermittently shunts the relay 231, causing it to energize and deenergize.

Before describing the selecting operation in detail the number of pulses, or interruptions, necessary to bring about such selection will be considered. The system disclosed is intended to accommodate 10,000 lines, and

the selector switches one of which is shown in Fig. 1 somewhat in detail, and the others of which are indicated diagrammatically in Fig. 5, are of the type'disclosed in Patent No. 1,123,696, and are 500-point switches. In utilizing switches of this type in a 10,000

line exchange, a connection can be extended from the cord, shown in Fig. 1, to any line in the exchange by the use of two switches, a group selector anda connector. The group selector is provided with five sets of brushes, each set of brushes having access to trunks leading to connectors having access to 2,000 lines. Therefore, the first selection, which is brush selection in the grou the case of the number assumed, 7 8 4 9, will be the fourth brush, as such number is found in the fourth roup of 2,000. The next selection is to se ect one of four groups'of 500 out of the selected oup of 2,000, which, in the case of the num er assumed, will be the fourth 500 group. The next selection is to select a group of 100 out of the selected grou of 500and which, in the case of the num er assumed, will be also the 4 fourth group. Having selected the hundreds group,

the tens and units in such roup will be selected, which in the case of the number sumed will be the fifth tens group and the tenth unit. Therefore, to select the desired number, 7 8 4 9, the following im ulses will the following detailed description of the selecting operation.

Upon the first energization of the rela 231, it being remembered that the No. thousands key is depressed and that the relay 404 is energized, the following circuit is established for the No. 3 counting relay: from battery, No. 3 counting relay, back contact and armature of the No. 3 counting relay, conductor 441, registen contact 442 (position 3), conductor 443, contact 232 (position 5), conductor 444, contact and armature of the stepping relay 231 to ground. The No. 3 counting relay closes at its'armature and contact a series circuit for the No. 3 counting relay which extends from battery, through the No. 3' counting relay, the No. 3 counting'relay, armature and contact of the No. 3 countin relay, contact 227 (position 5) to groun At the next energization of the stepping relay 231, ground is placed upon the conductor 441 over the circuit previously traced for the No. 3 counting relay thus causing the energization of the No. 2 counting relay, over a circuit from battery, through the No. 2 counting relay, back contact and armature of the No. 2 counting relay, front contact and armature of the N0. 3'counting relay, conductor 441, to ground as previously selector, in v traced. The-No. 2 counting relay whem Eture and front contact of the No. 2 counting relay, armature and front contact of the No. 3 counting relay, conductor 441, contact 442 (position 3) conductor 443, contact 232 (position 5), conductor 444, contact and ar- "mature of relay 231 to ground. Upon-the 'gization of the relay'103. The release ofenergization of the No. 1 counting relay, the No. 1 counting relay is energized in series therewith by way of the annature and contact of the No. 1' counting relay. Upon the next energization of the stepping relay ing relay and thence in parallel through the relay 0 and the relay 229 to the armature and contact of the 0 counting relay, contact 227 (position 5) to ground. The operation of the relay 229 opens the previously traced fundamental circuit and causes the deenerthe relay 103 opens the circuit of the updrive magnet 117 of the first group selector, causing the elevator shaft to stop. Relay 103 at this time closes at its back contact and right armature a circuit to drive the sequence switch 100 into position 4, which circuit extends from battery to the motor magnet of the sequence switch 100, contact 108 (position 3), back contact and right armature of the relay 103 to ground. When the No: 0 counting relay is energized, a circuit is established to drive the sequence switch 200 out of'position 5 into position 7.

This circuit extends from battery, through the motor magnet of the sequence switch 200, contact 221 (position 5), armature and contact of No. 0 counting relay to ground.

When the sequence switch 200 reaches position 7, the fundamental circuit is reestablished as the relay 229 is. released, when its energizing circuit is opened at contact 227 in position 6. The relay 103 and stepping relay 231 are again energized in this circuit. The energization of relay 103 at this time closes a circuit to drive the sequence switch 100 into position 5, which circuit extends from battery through the motor magnet of sequence switch 100, conmagnet will be operated.and will tri the fourth set of brushes, it being remem ered that the brush elevator was moved up four steps in its brush selecting movement.

Theselection of one of four groups of 500 will now take place under the control of: the counting relays, which are in turn controlled by the commutator 110 and steppln-g magnet 231 as the elevator shaft again moves upward. Upon the first energization of the stepping relay 231, a circuit is established for the No. 3 counting relay, it being remembered that the hundreds register cut-off relay 405 is energized. This circuit extends from battery through the No. 3 counting relay, back contact and armature of No. '3 counting relay, conductor 441, con- ,tact 223 (position 7), conductor 429, front contact and left armature of the register cut-ofi' relay 405, conductor 430, contact 232 (position 7), conductor 444, front contact and armature of the stepping relay 231 to ground. The energization of the No. 3 counting relay results in the energization of the No.3 counting relay as before. The No. 2 counting relay is energized upon the next energization of the relay 231 as before, and also causes the energization of the No. 2 counting relay. The energization of the No. 2 counting relay extends the circuit from ground at the stepping relay 231 as previously traced to the No. 3' counting relay over conductor 447, contact 225 (position 7 conductor 432, armature and front contact of cut-off relay 404, conductor 431, contact224 (position 7 conductor 445, back contact and armature of the No. 1 counting relay, to battery. Upon the energization of the No. 1 counting relay, the No. 1 counting relay is energized and upon the next energization of the stepping relay 2'3l,the N0. 0 counting relay is energized, causing the energization of the No. 0 counting relay and the cut-off relay 229, which will occur after four shuntings of the stepping relay 231 at the commutator 110. Attention is directed tothe fact that had an even numbered thousands key been depressed, the relay 404 would have been deenergized, and when the No. 2 counting relay was energized, instead of extending the circuit from the stepping relay to the No. 1 counting relay, such circuit would have been extended from the back contact and left armature of the relay 404, instead of the front contact, over conductor 450, contact 216 (position 7 conductor 451, through the No. 0 counting relay to battery, so that the No. 1 and No. 1 relays would have been skipped, and consequently, after three impulses the group selector.would have been stopped, instead of after four, as in the case assumed.

When the fundamental circuit is opened by the energizationof the relay 229, after four shuntings of the stepping relay 231,

the lrelays 103 and 231 are denergized. The release. of the relay 103 opens the previously traced circuit for the updrive magnet 117 and at its back contact and right armature closes a circuit to drive the sequence switch 100 into position 6, which circuit extends from battery, through the motor magnet of sequence switch 100, contact 108 (position 5), back contact and arma-.

ture of relay 103 to ground. As the group has now been selected, the group selector is started in motion for the purpose of hunting for an idle trunk leading to a connector switch. This hunting movement takes place under the control of a test relay (not shown), .the construction and operation of which are well-known. This operation and subsequent operations in which the group selector is involved, may take place in subsequent positions of the sequence switch 100. As the present invention, however, is not concerned with these operations, the circuits and apparatus necessary for performing them are not shown. It will be assumed, however, that an idle trunk is found leading to a final connector such as is diagrammatically shown in Fig. 5. As the connector switches of the 500-point type are wellknown in the art, the operation of such connector switch will not be described in detail. It is thought that it will be suificient for the purpose of the present invention to describe the operation of the register and counting relays in controlling the production of the impulses necessary for operating a final connector switch in order to direct it to the called line, assuming that the fundamental circuit is extended to such switch and the stepping relay at the sender is shunted in the usual manner during the movement of such switch.

When the No. 0 counting relay is energized in parallel with the cut-off relay 229 at the completion of the group selection in the group selector, a circuit is established to drive the sequence switch 200 into position 9, which circuit extends from battery, to the motor magnet of the sequence switch 200, contact 221 (position 7), armature and contact of the No. 0 counting relay to ground. In position 9 of the sequence switch 200 the fundamental circuit is established for the purpose of selecting one of five brushes at the final connector. As previously pointed out, the eight hundreds group Will be the fourth group in the connector and, hence, the fourth set of brushes should be selected. Therefore, after four operations of the step ing relay 231 the fundamental circuit s ould be opened. Upon the first operation of the stepping relay 231 a circuit is established for the No. 3' counting relay, which circuit extends from battery, through the No. 3' counting relay, back contact and armature of the No. 3

counting relay, conductor 441, hundreds.

register spring 451 (position 3),-conductor 452, contact 232 (position 9), conductor 444, front contact and armature of the relay 231 to ground. This circuit is extended by the energization of the No. 3 counting relay to the No. 2 counting relay upon the next energization of the stepping relay 231. The No. 2 counting relay, which is energized in response to the operation of the No. 2 counting relay, extends the circuit from the stepping magnet 231, over-conductor 447, contact 222 (position 9), conductor 445 to the No. 1 counting relay. ,Therefore, on thethird energization of the relay 231 the No. 1 counting relay is operated, and on the fourth the No. 0 and No. 0 counting relays are operated. The cut-off relay 209, which is operated parallel with the No. 0 counting relay, opens the fundamental circuit, and the fourth brush is selected at the connector switch in the usual manner. The No. 0 counting relay when energized drives the sequence switch 200 into position 11, over a circuit which extends from battery, through the motor magnet of the sequence switch 200, contact 221 (position 9), contact and ground at the contact and armature of the stepping relay 231.

The operation of the No. 5' counting relay energizes the No. 5- counting relay in the usual manner, and the energization of the No. 5 counting relay extends the circuit from the armature of the stepping relay 231 to the No. 4' counting relay. In response to the first, second, third and fourth operations of the stepping relay 231, the Nos. 5', 4, 3 and 2 counting relays are energized in the usual manner, as are also the Nos.

5, 4, 3 and 2 counting relays. The energization of the No. 2 counting relay, however,

owing to the fact that the cut-off relay 406 of the tens register has not been energized, extends the circuit'from the armature and contact of the stepping relay 231 direct to 447, contact 223 (position 11),condi1ctor 428, left-hand armature and back contact of the relay 406, conductor 457, contact 234 (position 11), conductor 451, the No. 0' counting relay the No. 5" counting relay is fundamental circuit is opened after five operations of the relay 231 instead of after six, owing to the fact that the No. 1 counting relay is skipped. It will be observed that the register cut-ofi' relay 406 is energized in response to the operation of an odd numbered key and fails to operate when an even numbered key is depresse Therefore, in the case of an even number, the No. 1' counting relay is skipped, whereas in the case of an odd number such counting relay is not skipped, although the samecounting relay is initially energized due to the depression of either one of two keys. For example, the Nos. 0 and 1 keys energize the same counting relay, also the Nos. 2 and 3, etc. ing relay is energized after five impulses, the No. 0 counting relay is energized in parallel and the fundamental circuit is opened, thus terminating the tens selection. The N0. 0 counting relay, however, establishes a circuit to drive the'sequence switch 200 into position 13, which circuit extends from battery, through motor magnet of the sequence switch 200, contact 221 (position 11), contact and armature of the No. 0 counting relay to ground. After the sequence switch leaves position 11, the counting'relays arerestored to normal, and the fundamental circuit is reestablished in posi-' tion 13 for the purpose of controlling units selection.

With the sequence switch 200 in position 13 upon the first energization of the stepping relay 23l, the No. 9. counting relay is energized over the following circuit: from battery, through No. 9 counting relay, contact and armature of the No. 9 counting relay, conductor 458, units register spring 459 (position 4), conductor 460, contact 233 (position 13), conductor 444, contact and armature of the relay 231 to ground. U on successive energizations of the stepping relay 231, the Nos. 8', 7', 6, 4', 3, 2, 9, 8, 7 6, 5, 4, 3 and 2 counting relays are energized. As the register cut-off relay 407 is also energized the operation of the No. 1 counting relay extends the circuit from the contact and armature of the stepping relay 231 on the next impulse to the No. 1 counting relay, over conductor 447, contact 222 (position 13), conductor 426, left-hand and front contact of relay 407,. conductor 42'5, contact 224 (position 13), conductor 445, back contact and armature of the No. 1 counting relay to the No. 1 counting relay. Therefore, on the next energization of the relay 231, the No. 1 counting relay to battery. Thus although energized, the

When the N0. 0 count is energized, which is followed upon the next energization of the stepping relay 231 by the energization of the Nos. 0 and 0 counting relays and cut-ofl' relay 229.,Had

number assumed, all the counting relays:

are utilized, and the fundamental circuit is opened at the relay229 after ten operations of the relay 231, thus terminating units selection.

As the present invention is not concerned with the subsequent operations of ringing the called subscriber and disconnecting at the termination of the conversation, these operations will not be described or disclosed, as it is thought the description of the operation of the sending equipment controlling the selection of a called line sufficient for the purposes of the present invention.

What is claimed is:

1. In a telephone exchange system utilizing automatic switches, a registering and controlling equipment comprising a counting device adapted to count and, measure either of two numbers, and means independent of the set position of the register controlled by such register settin means to discriminate between such num ers and to modify the operation of the counting device accordingly.

2. Ina telephone exchange system utilizing automatic switches, a registering and controlling equipment comprising a set of counting relays adapted to count and measure the number of controlling impulses for controlling such switches, a register adapted to control such counting relays, means for set-ting such register in one of a plurality of positions to register either of a plurality of numbers, and means independent of the set position of the register to discriminate between such numbers and to render certain of such counting relays ineffective or effective depending upon the particular number registered.

3. In a telephone exchange system utilizing automatic switches, a registering and controlling equipment comprising a set of counting relays adapted to count and measure the number of controlling impulses for such switches, a register adapted to be set in any one of a plurality of positions to register either of two numbers, manually controlled means for setting such register, means for energizing such counting relays in sequence synchronously with the production of such controlling'impulses,the number of counting relays in the sequence being bers.

4. In a telephone exchange system, a registering and controlling equipment comprising a set of ten digit keys grouped in pairs, a re 'ster adapted to be set in any one of a p urality of positions in response to the operation of either one of a pair of such keys, at set of counting relays adaptedto be energized in sequence to control the production of impulses, a relay controlled by one key of a pair, and means controlled jointly by the set position of the register and such relay for determining the number of counting relays in such sequence.

5. In a telephone exchange system, a registering and controlling equipment comprising a register, a set of ten digit keys arranged in pairs, means controlled by either key of a pair for setting such register in a position to register either of the numbers re resented by such pair of keys, a relay uti ized in settin such register, means controlled by one 0 such keys for subsequently o crating such relay, a counting device, an means controlled jointly by such relay and the said set position of the register for determming the extent of operation of such counting device.

6 In a telephone exchange system, a registerlng and controlling equipment comprising a register, a set of keys for controlhug the setting of such re ister, a set of counting relays adapted to be energized in sequence, means controlled bythe set position of the register for determining the number of counting relays normally included in such sequence and means controlled by certain of such keys for eliminating a counting relay from such sequence.

In witness WheI Q'Of I hereunto subscribe my name this 28 day of Dec. A. D., 1916.

WARREN W CARPENTER. 

